It looks like the 100 has regular battery cables on it. Battery tray is 10.5"w x 6.5" deep x looks like 9.5" tall.

here is a pic.

Well gonna chime here, I'm in the process of a restore of a 100 at present. I'm gonna use a battery that fits the box if it is a car battery or a lawn battery. Makes no difference to me. If it works?? what can I say?

Stock battery box with U1 battery.

Looks Good Bill, But my 100 has the car battery connections on it, Now maybe the PO changed them. Anyway I'm ordering a new wiring for it, so if it comes with that type of terminal, that is what I will use. Thanks for the pic.

Here's the specs on a NAPA 8223 battery


Battery BCI #: U1
Battery Cold Cranking Amps @ 0 Degrees F: 230
Battery Cranking Amps @ 32 Degrees F: 285
Battery Electrolyte Composition: Acid
Battery Posts Type: Top Post
Battery Voltage: 12
Battery Weight: 15.5 lbs
CA @ 32 Degrees Fahrenheit: 285
CCA @ 0 Degrees Fahrenheit: 230
Height: 7 1/4 in.
Length: 7 3/4 in.
Polarity: Left Positive

Here's a NAPA 7581R for a 1992 Mazda Miata

Battery BCI #: 46A24L
Battery Cold Cranking Amps @ 0 Degrees F: 320
Battery Cranking Amps @ 32 Degrees F: 400
Battery Electrolyte Composition: Glass Mat
Battery Posts Type: Top Post
Battery Reserve Capacity (Minutes): 45
Battery Weight: 25 lbs
Height: 7 1/4 in.
Length: 7 3/4 in.

There are manufacturers that make higher CCA L&G batteries.

FOr an example sears makes one thats 340 CCA
Actually. Im positive sears does not make this as there are only a few batteries manufacturers in the US and sears is not one of them. Anyway, yiu can get larger capacity L&G batteries is the point.

DieHard Sealed 340 amps Lawn and Garden BatteryItem no. 8367336 | LG-3
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$64.99

NAPA also carries a higher U1 battery.
8227
Battery BCI # U1
Battery Cold Cranking Amps @ 0 Degrees F 350
Battery Cranking Amps @ 32 Degrees F 430
Battery Electrolyte Composition Acid
Battery Posts Type Top Post
Battery Voltage 12
Battery Warranty in Months 12
Battery Weight 19 lbs
CA @ 32 Degrees Fahrenheit 430
CCA @ 0 Degrees Fahrenheit 350
Contents (1) Battery Assembly
Freight Class 65
Hazardous Material Yes
Height 7 1/4 in.
Length 7 3/4 in.

Battery in my early 100 has the same size battery as yours.

What is the serial number of your 100?

My 100 serial is 84XXX. It has a big battery with round post on it.

Found a picture of my 100 with a big battery: